Sorry, duped against the wrong bug. As commented in bug 1707120, this is still accessible via keyboard (CTRL+I), and in the padlock icon in the address bar (security connection info). As far as I know, there are no plans to reintroduce it, even behind a pref.
Bug 1708043 Comment 3 Edit History
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Sorry, duped against the wrong bug. As far as I know, there are no plans to reintroduce it, even behind a pref.